﻿using System;
using System.Collections.Generic;

namespace SecurityApp.Classes
{
    class DES
    {
        public static readonly int[] PC_1 =     { 57, 49, 41, 33, 25, 17,  9,  1, 58, 50, 42, 34, 26, 18, 10,  2,
                                                  59, 51, 43, 35, 27, 19, 11,  3, 60, 52, 44, 36, 63, 55, 47, 39,
                                                  31, 23, 15,  7, 62, 54, 46, 38, 30, 22, 14,  6, 61, 53, 45, 37,
                                                  29, 21, 13,  5, 28, 20, 12,  4 };

        public static readonly int[] PC_2 =     { 14, 17, 11, 24,  1,  5,  3, 28, 15,  6, 21, 10, 23, 19, 12,  4,
                                                  26,  8, 16,  7, 27, 20, 13,  2, 41, 52, 31, 37, 47, 55, 30, 40,
                                                  51, 45, 33, 48, 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32 };

        public static readonly int[] IP =       { 58, 50, 42, 34, 26, 18, 10,  2, 60, 52, 44, 36, 28, 20, 12,  4,
                                                  62, 54, 46, 38, 30, 22, 14,  6, 64, 56, 48, 40, 32, 24, 16,  8,
                                                  57, 49, 41, 33, 25, 17,  9,  1, 59, 51, 43, 35, 27, 19, 11,  3,
                                                  61, 53, 45, 37, 29, 21, 13,  5, 63, 55, 47, 39, 31, 23, 15,  7 };

        public static readonly int[] IP_INV =   { 40,  8, 48, 16, 56, 24, 64, 32, 39,  7, 47, 15, 55, 23, 63, 31,
                                                  38,  6, 46, 14, 54, 22, 62, 30, 37,  5, 45, 13, 53, 21, 61, 29,
                                                  36,  4, 44, 12, 52, 20, 60, 28, 35,  3, 43, 11, 51, 19, 59, 27,
                                                  34,  2, 42, 10, 50, 18, 58, 26, 33,  1, 41,  9, 49, 17, 57, 25 };

        public static readonly int[] E =        { 32,  1,  2,  3,  4,  5,  4,  5,  6,  7,  8,  9,  8,  9, 10, 11,
                                                  12, 13, 12, 13, 14, 15, 16, 17, 16, 17, 18, 19, 20, 21, 20, 21,
                                                  22, 23, 24, 25, 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32,  1 };

        public static readonly int[] P =        { 16,  7, 20, 21, 29, 12, 28, 17,  1, 15, 23, 26,  5, 18, 31, 10,
                                                   2,  8, 24, 14, 32, 27,  3,  9, 19, 13, 30,  6, 22, 11,  4, 25 };

        public static readonly int[] SHIFTS =   { 0,  1,  1,  2,  2,  2,  2,  2,  2,  1,  2,  2,  2,  2,  2,  2, 1 };

        public static readonly int[,] S1 =      { { 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7 }, 
                                                  { 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8 }, 
                                                  { 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0 }, 
                                                  { 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 } };
        
        public static readonly int[,] S2 =      { { 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10 }, 
                                                  { 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5 }, 
                                                  { 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15 }, 
                                                  { 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 } };

        public static readonly int[,] S3 =      { { 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8 }, 
                                                  { 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1 }, 
                                                  { 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7 }, 
                                                  { 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 } };

        public static readonly int[,] S4 =      { { 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15 }, 
                                                  { 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9 }, 
                                                  { 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4 }, 
                                                  { 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 } };

        public static readonly int[,] S5 =      { { 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9 }, 
                                                  { 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6 }, 
                                                  { 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14 }, 
                                                  { 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 } };

        public static readonly int[,] S6 =      { { 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11 }, 
                                                  { 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8 }, 
                                                  { 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6 }, 
                                                  { 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 } };

        public static readonly int[,] S7 =      { { 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1 }, 
                                                  { 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6 }, 
                                                  { 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2 }, 
                                                  { 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 } };

        public static readonly int[,] S8 =      { { 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7 }, 
                                                  { 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2 }, 
                                                  { 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8 }, 
                                                  { 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 } };

        public static List<int[,]> SBOXES = new List<int[,]>();

        static DES()
        {
            SBOXES.Add(S1);
            SBOXES.Add(S2);
            SBOXES.Add(S3);
            SBOXES.Add(S4);
            SBOXES.Add(S5);
            SBOXES.Add(S6);
            SBOXES.Add(S7);
            SBOXES.Add(S8);
        }

        public static readonly String[] weakKeys = { "0101010101010101", "fefefefefefefefe", "1f1f1f1f1f1f1f1f",
                                                     "e0e0e0e0e0e0e0e0",

                                                     // semi-weak keys
                                                     "01fe01fe01fe01fe", "fe01fe01fe01fe01", "1fe01fe01fe01fe0",
                                                     "e01fe01fe01fe01f", "01e001e001e001e0", "e001e001e001e001",
                                                     "1ffe1ffe1ffe1ffe", "fe1ffe1ffe1ffe1f", "011f011f011f011f",
                                                     "1f011f011f011f01", "e0fee0fee0fee0fe", "fee0fee0fee0fee0",

                                                    // mogelijke weak keys
                                                    "1f1f01010e0e0101", "e00101e0f10101f1", "011f1f01010e0e01",
                                                    "fe1f01e0fe0e01f1", "1f01011f0e01010e", "fe011fe0fe010ef1",
                                                    "01011f1f01010e0e", "e01f1fe0f10e0ef1", "fe0101fefe0101fe",
                                                    "e0e00101f1f10101", "e01f01fef10e01fe", "fefe0101fefe0101",
                                                    "e0011ffef1010efe", "fee01f01fef10e01", "fe1f1ffefe0e0efe",
                                                    "e0fe1f01f1fe0e01", "fee0011ffef1010e", "1ffe01e00efe01f1",
                                                    "e0fe011ff1fe010e", "01fe1fe001fe0ef1", "e0e01f1ff1f10e0e",
                                                    "1fe001fe0ef101fe", "fefe1f1ffefe0e0e", "01e01ffe01f10efe",
                                                    "fe1fe001fe0ef101", "0101e0e00101f1f1", "e01ffe01f10efe01",
                                                    "1f1fe0e00e0ef1f1", "fe01e01ffe01f10e", "1f01fee00e0ef1f1",
                                                    "e001fe1ff101fe0e", "011ffee0010efef1", "1f01e0fe0e01f1fe",
                                                    "01e0e00101e1e101", "011fe0fe010ef1fe", "1ffee0010efef001",
                                                    "0101fefe0101fefe", "1ffee0010ef1fe01", "1f1ffefe0e0efefe",
                                                    "01fefe0101fefe01", "1fe0e0f10ef1f10e", "fefee0e0fefef1f1",
                                                    "01fee01f01fef10e", "e0fefee0f1fefef1", "01e0fe1f01f1fe0e",
                                                    "fee0e0fefef1f1fe", "1ffefe1f0efefe0e", "e0e0fefef1f1fefe" };

    }
}
